Basic Transformer Calculations
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Date: 2023-11-17
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Comments and reviews: 13
Senthil
Most of us need transformer primary and secondary turns, if you want to design primary 220V& secondary 12V 50Hz, 1KVA, Efficiency 85%
First of all calculate the core size =wattage of secondary/5. 53
Say 1000/5. 53
31. 6/5. 53= 5. 71 Sq-in (square inches)
Add 15% say 6. 56sq-in
For 50Hz Primary turns Np=7. 5/area of core size in inches
Say 7. 5/6. 56= 1. 15 turns/volt for 220x1. 15=253 Turns
Secondary 12x1. 15 =13. 8 turns
Wire size current carrying capacity 3. 5 to 4amps /sqmm for transformer
Primary current=1150/220= 5. 2A, 5. 2/3. 5=1. 48sqmm
Secondar current=1150/12=95. 8A
96/3. 5=27. 4sqmm
reply
Most of us need transformer primary and secondary turns, if you want to design primary 220V& secondary 12V 50Hz, 1KVA, Efficiency 85%
First of all calculate the core size =wattage of secondary/5. 53
Say 1000/5. 53
31. 6/5. 53= 5. 71 Sq-in (square inches)
Add 15% say 6. 56sq-in
For 50Hz Primary turns Np=7. 5/area of core size in inches
Say 7. 5/6. 56= 1. 15 turns/volt for 220x1. 15=253 Turns
Secondary 12x1. 15 =13. 8 turns
Wire size current carrying capacity 3. 5 to 4amps /sqmm for transformer
Primary current=1150/220= 5. 2A, 5. 2/3. 5=1. 48sqmm
Secondar current=1150/12=95. 8A
96/3. 5=27. 4sqmm
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Mike
Most of that is a Turns Ratio, still it's better to have these formulas especially when figuring transformer losses in percentages which is real life operation.
I'm not an engineer, but when I installed inverters in vehicles there was some math involved to figure total wattage consumption, which included about 10% over total watts which then gave me what I needed to know for the Battery Power input, cable sizes and what type of charging system would be needed for the vehicle and if necessary vehicle parked, engine off external charging.
Thankyou for this video.
reply
Most of that is a Turns Ratio, still it's better to have these formulas especially when figuring transformer losses in percentages which is real life operation.
I'm not an engineer, but when I installed inverters in vehicles there was some math involved to figure total wattage consumption, which included about 10% over total watts which then gave me what I needed to know for the Battery Power input, cable sizes and what type of charging system would be needed for the vehicle and if necessary vehicle parked, engine off external charging.
Thankyou for this video.
reply
Butta
Why did you reverse the turns ratio in the first formula & use multiplication? Why not divide primary winding by secondary winding for the reduced turns ratio, then divide prim. voltage by the the reduced ratio (10 /1? Multiple ways to do the same thing I guess? Idk am I missing something that makes using the formula easier?
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Why did you reverse the turns ratio in the first formula & use multiplication? Why not divide primary winding by secondary winding for the reduced turns ratio, then divide prim. voltage by the the reduced ratio (10 /1? Multiple ways to do the same thing I guess? Idk am I missing something that makes using the formula easier?
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ApexPredator_
Is the diameter of turns irrelevant? The only important thing is number of turns?
Like if I have a 20cm diameter per turn (JUST FOR EXAMPLE) but 1000 turns on primary and 100 turns on secondary, would I still get 12v output from a 120v input?
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Is the diameter of turns irrelevant? The only important thing is number of turns?
Like if I have a 20cm diameter per turn (JUST FOR EXAMPLE) but 1000 turns on primary and 100 turns on secondary, would I still get 12v output from a 120v input?
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education
How does the wire gauge of the windings affect transformer outputs? Particularly curious when the gauge used on the primary is different from the gauge used on the secondary.
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How does the wire gauge of the windings affect transformer outputs? Particularly curious when the gauge used on the primary is different from the gauge used on the secondary.
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Montech
And what's the altogether VA of a (vintage, 1970s) transformer when there's N0 indication about current on both primary and secondaries? Thank you a million.
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And what's the altogether VA of a (vintage, 1970s) transformer when there's N0 indication about current on both primary and secondaries? Thank you a million.
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Amit
I request to all learner guys don't mug-up these formula.
Be smart so go through ratio methode
N1V1=N2 V2 or (N1/N2=V2/V1)
V1/V2=I1/I2
N1/N2=I1/I2
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I request to all learner guys don't mug-up these formula.
Be smart so go through ratio methode
N1V1=N2 V2 or (N1/N2=V2/V1)
V1/V2=I1/I2
N1/N2=I1/I2
reply
Eagle19
I'm glad that we don't need to do any of this in HVAC haha. If a transformer isn't working, we just replace it. The customer has no heat, damnit!
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I'm glad that we don't need to do any of this in HVAC haha. If a transformer isn't working, we just replace it. The customer has no heat, damnit!
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Servis
this doesnt even need a formula, it is just the ratio of turns that determines the voltage and the ratio of wire size that determines the current
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this doesnt even need a formula, it is just the ratio of turns that determines the voltage and the ratio of wire size that determines the current
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Beach&BoardFan
Is there any value in adding more turns but not changing the primary and secondary ratio?
Example, 100 p 1000s vs 1000 p 10000s?
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Is there any value in adding more turns but not changing the primary and secondary ratio?
Example, 100 p 1000s vs 1000 p 10000s?
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Paul
Would love to see you create a similar video on three phase transformers connected star star, delta delta and so on.
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Would love to see you create a similar video on three phase transformers connected star star, delta delta and so on.
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Sunil
How does something like a phone charger cut the outlet voltage in a house to about 5V to charge a phone via USB?
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How does something like a phone charger cut the outlet voltage in a house to about 5V to charge a phone via USB?
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resty
Pinaikot ikot mo lang given na mga nilagay mo. Ndi mo pinakita pano mo nakuha mga nilagay mo dyan shortcut
reply
Pinaikot ikot mo lang given na mga nilagay mo. Ndi mo pinakita pano mo nakuha mga nilagay mo dyan shortcut
reply
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